|San Carlos has year-round mild weather with cool summer breezes off of the Sea of Cortez. San Carlos Sonora Mexico is located in the Sonoran dessert along the coast. With average rainfall of approximately 10 inches per year, mostly in the summer months. During the summer in San Carlos Mexico can get quite warm with average temperatures in the mid 90's. In the winter San Carlos cools down with average winter temperatures in the low 70's. San Carlos is a favorite spot for senior American tourists known as “snow birds," who arrive during winter in caravans to enjoy a vacation period with a nicer weather than that available at home.